Formatting of the Calendar for Appointments plugin needs to be looked at. It seems to be misaligned. Also the legends don't show up.
There is a known JS conflict issue with another plugin. But in this case I could not find any conflicts with other plugins or any of my code because I have gone through the process of elimination.
For details of the other issue, please refer - https://premium.wpmudev.org/forums/topic/need-to-resolve-conflicting-js-between-social-marketing-and-appointments-plugin